Chava Rama Krishna, Kang Misook
Department of Chemistry, College of Natural Sciences, Yeungnam University, 280 Daehak-ro, Gyeongbuk 38541, Gyeongsan, Republic of Korea.
Nanomaterials (Basel). 2023 Sep 21;13(18):2614. doi: 10.3390/nano13182614.
The visible-light-driven photocatalytic degradation of pharmaceutical pollutants in aquatic environments is a promising strategy for addressing water pollution problems. This work highlights the use of bromine-ion-doped layered Aurivillius oxide, BiWO, to synergistically optimize the morphology and increase the formation of active sites on the photocatalyst's surface. The layered BiWO nanoplates were synthesized by a facile hydrothermal reaction in which bromine (Br) ions were introduced by adding cetyltrimethylammonium bromide (CTAB)/tetrabutylammonium bromide (TBAB)/potassium bromide (KBr). The as-synthesized BiWO nanoplates displayed higher photocatalytic tetracycline degradation activity (83.5%) than the BiWO microspheres (48.2%), which were obtained without the addition of Br precursors in the reaction medium. The presence of Br was verified experimentally, and the newly formed BiWO developed as nanoplates where the adsorbed Br ions restricted the multilayer stacking. Considering the significant morphology change, increased specific surface area, and enhanced photocatalytic performance, using a synthesis approach mediated by Br ions to design layered photocatalysts is expected to be a promising system for advancing water remediation.
可见光驱动的光催化降解水环境中的药物污染物是解决水污染问题的一种有前景的策略。这项工作重点介绍了使用溴离子掺杂的层状钙钛矿氧化物BiWO，以协同优化光催化剂表面的形态并增加活性位点的形成。通过简便的水热反应合成了层状BiWO纳米片，其中通过添加十六烷基三甲基溴化铵（CTAB）/四丁基溴化铵（TBAB）/溴化钾（KBr）引入溴（Br）离子。合成的BiWO纳米片比在反应介质中不添加Br前驱体而获得的BiWO微球表现出更高的光催化四环素降解活性（约83.5%）。通过实验验证了Br的存在，新形成的BiWO发展为纳米片，其中吸附的Br离子限制了多层堆积。考虑到显著的形态变化、比表面积增加和光催化性能增强，使用由Br离子介导的合成方法来设计层状光催化剂有望成为推进水修复的一个有前景的体系。
